330702-00-24-10-02-05 Bently Nevada 3300 XL 11mm Proximity Sensor Probe

Product Executive Overview

The Bently Nevada 330702-00-24-10-02-05 is an industrial-grade 3300 XL 11 mm Proximity Probe engineered for long linear range vibration and displacement tracking. Vibration instrumentation specialists specify this transducer system when extended linear range is required or when target counterbore dimensions prevent standard 8 mm probe installation.

Constructed with an aggressive 1/2-20 UNF threaded AISI 304 stainless steel casing, this armored model incorporates heavy-duty flexible stainless steel armor over 75 Ohm triaxial fluoroethylene propylene insulated cable. The polyphenylene sulfide tip encapsulation resists chemical attack and harsh industrial process environments.

Global PLC Spare HUB Insight & Field Engineering Review

In turbomachinery protection applications, standard 8 mm probes reach limits when shaft target movement exceeds 2.0 mm (80 mils). The Bently Nevada 3300 XL 11mm Series extends linear range to 4.0 mm (160 mils), making the 330702-00-24-10-02-05 essential for large steam turbine thrust position measurements and rod drop monitoring on reciprocating gas compressors.

During a field retrofit on a high-pressure boiler feed pump, engineers encountered excessive mechanical shaft float during startup sequences. Replacing standard short-range sensors with the 330702-00-24-10-02-05 prevented voltage saturation at maximum axial excursion, preserving critical machinery alarm logic without unexpected trips.

Configuration Breakdown (Part Number Hierarchy)

• 330702 — Product Series: 3300 XL 11 mm Probe (1/2-20 UNF Thread, Armored)
•   └── 00 — Unthreaded Length Option: 0.0 inches
•       └── 24 — Overall Case Length Option: 2.4 inches
•           └── 10 — Total Length Option: 1.0 meter (3.3 feet)
•               └── 02 — Connector & Cable Option: Miniature coaxial ClickLoc connector, standard cable
•                   └── 05 — Agency Approval Option: Multiple Hazardous Area Approvals (CSA, ATEX, IECEx)

Technical Parameters & Operating Limits

• Manufacturer: Bently Nevada
• Model Part Number: 330702-00-24-10-02-05
• Product Series: 3300 XL 11 mm Transducer System
• Case Threads: 1/2-20 UNF-2A (Max thread engagement: 0.750 in)
• DC Resistance (RPROBE): 5.9 ± 0.5 Ohms (Center conductor to outer conductor)
• Cable Specification: 75 Ohm triaxial FEP insulated cable with flexible SST armor
• Connector Construction: Miniature coaxial ClickLoc gold-plated brass lock mechanism
• Maximum Case Torque: 45.2 N·m (400 in·lb) | Recommended: 15.2 N·m (133 in·lb)
• Connector Torque Rating: Finger tight (Recommended) | Max limit: 0.565 N·m (5 in·lb)
• Minimum Cable Bend Radius: 25.4 mm (1.0 inch)
• Operating & Storage Temperature: -52°C to +177°C (-62°F to +351°F)
• Sealing Mechanism: Internal Viton O-ring pressure seal
• Shipping Weight: 0.17 kg (0.37 lbs)

Selection Comparison & Engineering Advice

Engineering Advice: Select the 330702-00-24-10-02-05 when deploying probes inside hazardous process zones that demand certified intrinsic safety approvals and require flexible conduit routing back to an external junction box. If your machine design requires liquid-tight sealing along the cable core to block oil migration out of the bearing box, select the 330702-00-26-50-12-00 FluidLoc probe instead.

Application Scenarios & Machinery Diagnostics

• Thrust position tracking on high-power steam turbine generators and heavy industrial gas turbines.
• Reciprocating compressor piston rod drop measurement and crosshead slide alignment detection.
• Differential expansion monitoring on large power generation turbomachinery trains.
• Early fault detection for severe rotor thermal growth, axial collar wear, and extreme shaft surge conditions.

Installation, Maintenance & Logistics Terms

Mount the probe body using a calibrated torque wrench, taking care not to exceed 15.2 N·m (133 in·lb) recommended mounting torque on the 1/2-20 threads. Maintain cable bend radius above 25.4 mm (1.0 inch) to prevent inner dielectric layer degradation.

Connect coaxial ClickLoc fittings hand-tight until the internal detent mechanism locks firmly. Verify baseline DC loop resistance reads approximately 5.9 Ohms between the center pin and outer shell during loop checks.

Package Contents: 1 x Bently Nevada 330702-00-24-10-02-05 Proximity Probe, complete with protective connector cap and factory calibration documentation.

Global Dispatch & Freight: Orders process and ship in 24 to 48 hours. Express delivery via FedEx, UPS, and DHL air cargo worldwide.

Warranty Policy: Covered by a full 12-month operational warranty against mechanical and electrical manufacturing defects under specified operating conditions.

Frequently Asked Questions & Field Engineering Guidance

Q1: Why choose an 11 mm proximity probe over a standard 8 mm proximity probe?

A1: 11 mm probes provide double the linear measurement range (4.0 mm vs. 2.0 mm), making them necessary for applications with large physical displacement such as axial thrust collar movement or rod drop monitoring.

Q2: Can I install this 1.0-meter probe directly into a 9.0-meter Proximitor sensor without an extension cable?

A2: No, total system electrical length must match sensor design. A 1.0-meter probe requires an 8.0-meter extension cable when matched with a 9.0-meter Proximitor to maintain correct system calibration scale factor.

Q3: What indicates a failing probe cable during field resistance checks?

A3: A healthy 1.0-meter 11 mm probe cable measures 5.9 ± 0.5 Ohms across center conductor to outer shield. Open circuits (infinite resistance) or short circuits below 4.0 Ohms indicate internal conductor fatigue or moisture ingress.

Q4: What is the primary operational risk if ambient temperatures fall below -34°C (-30°F)?

A4: Sub-zero exposure below -34°C stiffens the internal Viton O-ring seal, which can compromise the differential pressure seal between the probe tip and metal body, leading to potential oil leakage.

Q5: How do Option 05 agency approvals affect field wiring practices in hazardous areas?

A5: Option 05 compliance certifies the probe for intrinsic safety and non-incendive environments. Field installation must follow hazardous area wiring guidelines, incorporating safety barriers or IS isolators in control cabinets.

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